NSG 520A Final Exam Questions With Complete Solutions
___ Cu alloys have lower creep because Correct Answers High
Cu alloys have lower creep because Eta phase crystals interlock
and prevent slippage
______ aids in making a choice between a custom-designed post
and a prefabricated post. Correct Answers Canal configuration
______ are one of the most effective EBD strategies we have to
arrest existing active noncavitated caries lesions Correct
Answers sealants
______ are one of the most effective EBD strategies we have to
prevent dental caries in at risk surfaces Correct Answers
sealants
(anteriors) core and crown IF Correct Answers there is
significant coronal destruction
- Endodontically treated anterior tooth needs crown, a post often
is indicated.
- Anterior teeth must resist lateral and shearing types of forces
• • The pulp chambers are too small to provide adequate
retention and resistance without a post.
(anteriors) no core, post, or crown IF Correct Answers -
minimal coronal destruction
- close the access w composite
*** I might need to watch lec 13 # because I didnt go Correct
Answers
,**posterior layering slides were not in the posted ppt Correct
Answers
•Cracks are often very difficult / easy to locate on a radiograph.
Correct Answers difficult
•Mesio-distal cracks can never be seen.
•Bucco-lingual cracks are only apparent if the crack is at the
angle of the x-ray beam.
•Fractured cusps: Correct Answers •Rarely damages the pulp
•Often breaks around a restoration
•Usually does not cause pain
<0.25mm RDT → Correct Answers 68.3% odontoblast
survival and slight tertiary dentin
>1mm RDT → Correct Answers 100% odontoblast survival
and slight tertiary dentin
0.25-0.5mm RDT → Correct Answers 82.5% odontoblast
survival and significant tertiary dentin
0.5-1mm RDT → Correct Answers 88.9% odontoblast survival
and slight tertiary dentin
2 effects of Carbopol Correct Answers Makes gel thixotropic
(thick & sticky)
• Stays in tray better
• Less tasting and swallowing of the gel
• Less material used
,Prolongs activity; slows O2 release
• Delays breakdown by salivary peroxidases
• Need to replenish material less often
2 Metallic intradentinal pin systems Correct Answers 1.
friction locked - uses slow speed
2. self-threading - uses manual wrench, engages dentin as it is
inserted
2 types of sealers Correct Answers cavity varnishes, bonding
agents
3 toothpastes to Prevent Sensitivity Correct Answers •Sodium
fluoride
•Stannous fluoride
•Potassium nitrate
4 bleaching contraindications Correct Answers 1. Active dental
disease (Pulpitis, Periodontitis, Soft tissue ulcerations, Rampant
caries, defective restorations)
2. Open wounds or healing surgical sites
3. Allergies to peroxides (rare) or plastics •
4. Pregnancy/nursing (not tested for safety)
4 parts of tofflemire retainer Correct Answers 1. Head - "U"
shaped end with slots from which the band extends
2. Slide - has a diagonal slot
3. Rotating spindle - adjusts the distance between the slide and
the head, increasing or decreasing the size of the band loop
4. Set-screw - tightens the band in the slide
, 4 steps of shade matching Correct Answers 1. shade selection
2. shade mapping
3. layering thickness
4. shade reproduction (discs, diamond burs, etc - make It look
natural)
5 Cases which do not Respond Well to Bleaching: Correct
Answers 1. Inorganic stains from metals
2. Fluorosis or decalcification stains unresponsive to
microabrasion
3. Dark gray or blue stains
4. Moderate-severe tetracycline stains
5. May bleach eventually but requires long duration of treatment
5 common problems + solutions with pins Correct Answers 1)
Broken pins
During bending or over-screwing in the hole. Solution - leave in
place
2) Loose pins
Loosened while shortened Pinhole is too large. Solution -
remove pin and fit a new size or drill another hole 1.5mm away
and set another pin and use the old hole for an amalgapin
3) Penetration into the pulp
Do not leave the pin / Check for bleeding Solution - Do a pulp
cap (may result in RCT)
4) Lateral perforation - crown area. Solution - Cut pin flush with
tooth surface and leave, cut pin flush with tooth
surface extend restoration apically or remove pin, enlarge hole
and restore with amalgam
___ Cu alloys have lower creep because Correct Answers High
Cu alloys have lower creep because Eta phase crystals interlock
and prevent slippage
______ aids in making a choice between a custom-designed post
and a prefabricated post. Correct Answers Canal configuration
______ are one of the most effective EBD strategies we have to
arrest existing active noncavitated caries lesions Correct
Answers sealants
______ are one of the most effective EBD strategies we have to
prevent dental caries in at risk surfaces Correct Answers
sealants
(anteriors) core and crown IF Correct Answers there is
significant coronal destruction
- Endodontically treated anterior tooth needs crown, a post often
is indicated.
- Anterior teeth must resist lateral and shearing types of forces
• • The pulp chambers are too small to provide adequate
retention and resistance without a post.
(anteriors) no core, post, or crown IF Correct Answers -
minimal coronal destruction
- close the access w composite
*** I might need to watch lec 13 # because I didnt go Correct
Answers
,**posterior layering slides were not in the posted ppt Correct
Answers
•Cracks are often very difficult / easy to locate on a radiograph.
Correct Answers difficult
•Mesio-distal cracks can never be seen.
•Bucco-lingual cracks are only apparent if the crack is at the
angle of the x-ray beam.
•Fractured cusps: Correct Answers •Rarely damages the pulp
•Often breaks around a restoration
•Usually does not cause pain
<0.25mm RDT → Correct Answers 68.3% odontoblast
survival and slight tertiary dentin
>1mm RDT → Correct Answers 100% odontoblast survival
and slight tertiary dentin
0.25-0.5mm RDT → Correct Answers 82.5% odontoblast
survival and significant tertiary dentin
0.5-1mm RDT → Correct Answers 88.9% odontoblast survival
and slight tertiary dentin
2 effects of Carbopol Correct Answers Makes gel thixotropic
(thick & sticky)
• Stays in tray better
• Less tasting and swallowing of the gel
• Less material used
,Prolongs activity; slows O2 release
• Delays breakdown by salivary peroxidases
• Need to replenish material less often
2 Metallic intradentinal pin systems Correct Answers 1.
friction locked - uses slow speed
2. self-threading - uses manual wrench, engages dentin as it is
inserted
2 types of sealers Correct Answers cavity varnishes, bonding
agents
3 toothpastes to Prevent Sensitivity Correct Answers •Sodium
fluoride
•Stannous fluoride
•Potassium nitrate
4 bleaching contraindications Correct Answers 1. Active dental
disease (Pulpitis, Periodontitis, Soft tissue ulcerations, Rampant
caries, defective restorations)
2. Open wounds or healing surgical sites
3. Allergies to peroxides (rare) or plastics •
4. Pregnancy/nursing (not tested for safety)
4 parts of tofflemire retainer Correct Answers 1. Head - "U"
shaped end with slots from which the band extends
2. Slide - has a diagonal slot
3. Rotating spindle - adjusts the distance between the slide and
the head, increasing or decreasing the size of the band loop
4. Set-screw - tightens the band in the slide
, 4 steps of shade matching Correct Answers 1. shade selection
2. shade mapping
3. layering thickness
4. shade reproduction (discs, diamond burs, etc - make It look
natural)
5 Cases which do not Respond Well to Bleaching: Correct
Answers 1. Inorganic stains from metals
2. Fluorosis or decalcification stains unresponsive to
microabrasion
3. Dark gray or blue stains
4. Moderate-severe tetracycline stains
5. May bleach eventually but requires long duration of treatment
5 common problems + solutions with pins Correct Answers 1)
Broken pins
During bending or over-screwing in the hole. Solution - leave in
place
2) Loose pins
Loosened while shortened Pinhole is too large. Solution -
remove pin and fit a new size or drill another hole 1.5mm away
and set another pin and use the old hole for an amalgapin
3) Penetration into the pulp
Do not leave the pin / Check for bleeding Solution - Do a pulp
cap (may result in RCT)
4) Lateral perforation - crown area. Solution - Cut pin flush with
tooth surface and leave, cut pin flush with tooth
surface extend restoration apically or remove pin, enlarge hole
and restore with amalgam
